Vane for rotary pumps



United States Patent 3,000,324 VANE FOR ROTARY PUNEPS Oscar E. Rosaen, Grosse Pointe, Micl1., assignor to The Rosaen Filter Company, Hazel Park, Mich., a corporation of Michigan Filed Oct. 6, 1958, Ser. No. 765,605 3 Claims. (Cl. 103-136) The present invention relates to vanes for use in rotary fluid pumps and more specifically to vanes which m use do not exert undue pressure against the cam ring with which the vanes contact and which regulates the radial movement of said vanes.

Among the objects of the invention is to provide a vane having means to balance the fluid pressures tending to move the vanes into and out of the vane slots.

Another object is to provide a vane with means for centering the vanes in an axial direction in the slots of the rotor.

Other objects will readily appear to those skilled in the art upon reference to the following description and the accompanying drawings in which FIGURE 1 is an elevational view of a vane of the present invention.

FIGURE 2 is a top view of the same.

FIGURE 3 is a view in elevation of the right end of FIGURE 1.

FIGURE 4 is a fragmentary view of a rotor showing a vane.

As is the case with all vanes for vane type rotary pumps, the present ones will be made preferably of hardened steel and finished by a final grinding.

In order to simplify and make entirely clear the following description, the term face will be used to designate the two faces of the largest areas, the term end will be used to indicate the radially inner and outer ends when the vane is in operation, and the term side will designate those surfaces adjacent the cheek plates in the assembled pump.

As indicated, the vane, as a whole designated by the numeral 10, consists of a rectangular plate having one plane end 11--the radially inner endand the other endthe radially outer endbeveled as at 12 with the tip portion 15 ground on an arc, the center of which is outside of the body, so that the tip is substantially in the plane of the face 16.

The face 17 is provided with a wide channel 18 extending from top to bottom and open to both the bottom 11 and the bevel portion 12. In addition to the channel 18 other channels 19 will be provided by bevelling those edges of face 17 adjacent the sides 20 of the vanes. Further, the sides 20 of the vane are not as is usual normal to the front and back faces but instead are ground at a small angle of from to 30 minutes (0 100 30) to a plane normal to the face 16, as indicated by the dotted lines 21. The sides 20 therefore slant inwardly from the face 16, thereby giving the face 17 a face of slightly shorter dimension than the transverse dimension of the face 16.

As indicated in FIGURE 4, the vane 10 is arranged in a rotor 25 in a slot 26 with the bevel 12 and face 17 forward in rotation of the rotor 25.

The developed fluid pressure applied to the vane and tending to move it radially of the rotor acts substantially equally upon both ends of the vane due at the channels 18 and 19. Further, the fluid cushions provided at the sides by the angular side faces 2020 are at equal presice sure and will therefore maintain the vane substantially balanced and centered axially of the rotor, and thereby prevent side thrust of the vane.

I claim:

1. A vane for use in radially movable vane type fluid pumps, said vane comprising a rectangular plate-like member having forward and rear faces, radially disposed outer and inner end surfaces and lateral side edge surfaces, said member having its lateral side edge surfaces both slanted inwardly from one face of said member throughout substantially the entire side edge surface toward the other face of said member, said member having its radially outer end surface bevelled with the outer tip portion arcuate, the outer edge of said arcuate tip portion being disposed substantially in the plane of the adjacent face, and an open channel formed in said other face of said member leading from said bevel through to the opposite inner end of said member, said slanted lateral side edge surfaces being slanted inwardly toward said other face of said member having said channel, said last mentioned face being the forward face of said vane during rotary movement under operative conditions.

2. A vane for use in radially movable vane type fluid pumps, said vane comprising a rectangular plate-like member having forward and rear faces, radially disposed outer and inner end surfaces and lateral side edge surfaces, said member having its lateral side edge surfaces both slanted inwardly from one face of said member throughout substantially the entire side edge surface toward the other face of said member, said member having its radially outer end surface bevelled with the outer tip portion arcuate, the outer edge of said arcuate tip portion being disposed substantially in the plane of the adjacent face, and an open channel formed in said other face of said member leading from said bevel through to the opposite inner end of said member, said slanted lateral side edge surfaces being slanted inwardly toward said other (face of said member having said channel at an angle of from 0 10' to 0 30 to a plane normal to said one face, said other face being the forward face of said vane during rotary movement under operative conditions.

3. A vane for use in a radially movable vane type fluid pump, said vane comprising a substantially rectangular plate having its side edges which are disposed adjacent the cheek plates of said pump when assembled slanting inwardly from one face at an angle of from 0 10' to 0 30', with reference to a plane normal to the faces of said vane, the shorter dimension face thereby produced being the forward face of said vane during rotary movement under operating conditions.

References Cited in the file of this patent UNITED STATES PATENTS 1,805,063 Wrona May 12, 1931 2,393,223 Rosen Jan. 15, 1946 2,545,238 MacMillin et a1 Mar. 13, 1951 2,644,402 Lehman July 7, 1953 2,656,796 Garner et al. Oct. 27, 1953 2,731,919 Prendergast Jan. 24, 1956 FOREIGN PATENTS 137,234 Austria Apr. 25, 1934 185,160 Great Britain Aug. 28, 1922 373,296 Italy July 24, 1939 479,644 Italy Apr. 7, 1953 574,364 Great Britain Jan. 2, 1946 

